Answer:
One way to test the hypothesis is to create two waves, one in the air and one on the ground at the same time. One of them for the elephant to get closer and another for the elephants to move away. Observe the reaction of the animal and with this we know which sound came first.
Explanation:
This hypothesis is based on the fact that the speed of sound in air is v = 343 m / s with a small variation with temperature.
The speed of sound in solid soil is an average of the speed of its constituent media, giving values between
wood 3900 m / s
concrete 4000 m / s
fabrics 1540 m / s
earth 5000 m / s wave S
ground 7000 m / s P wave
we can see that the speed on solid earth is an order of magnitude greater than in air.
One way to test the hypothesis is to create two waves, one in the air and one on the ground at the same time. One of them for the elephant to get closer and another for the elephants to move away. Observe the reaction of the animal and with this we know which sound came first.
From the initial information, the wave going through the ground should arrive first.
Answer:
The forces that do non-zero work on the block are gravity and normal reaction force
Explanation:
In this question we have given,
mass of the wooden block,
angle between ramp and horizontal surface,
in this case ramp is friction less so friction force will be zero and hence work done due to friction force will be zero.
As wooden block is sliding down due to gravity(gravity is pulling the block in downward direction).
so two forces will act on wooden block as it slides down the ramp that are gravity and normal reaction force.
Therefore, the forces that do non-zero work on the block are gravity and normal reaction force.
Explanation:
The contents of alcohol are less toxic and will evaporate quickly as compared to the mercury-in-glass thermometer. Since, alcohol starts boiling at 80℃ while the boiling point of mercury is 375℃. ... So, an alcohol thermometer cannot measure the temperature of boiling water as it has the limit to measures up to 80℃.
Answer:
t = 1.319 s
Explanation:
Let's use the free fall relationships
y = y₀ + v₀ t + ½ g t²
In this case, as the initial velocity is dropped, it is zero and when it reaches the floor, its height is zero.
0 = y₀ + 0 + ½ g t²
t = √ (-2y₀ / g)
t = √ (- 2 8.5344 / (-9.8))
t = √ (1.7417)
t = 1.319 s
Answer:
Advantage: Mercury has a lower freezing point (-1140 degree Celsius)
Disadvantage: Mercury has a lower boiling point